For those outside Australasia the car he is referring to is the same as a Chevy Cruze, I think.

The 530i should be more responsive, mine probably has a half second delay for kickdown. The thing you also have to consider is the extra torque in the I6 means that the car moves faster, unlike a smaller engine in an only slightly smaller sedan which has to work harder.

Half a second, that's far better! I could definitely cope with that. Thanks for giving some numbers. I guess with the much higher power to weight ratio, even before it changes it will be better.

Yep it looks the same as a chevy Cruze. They're surprisingly heavy cars. When I first saw it, I thought I'd be driving something with a fairly hefty engine, but it was not so.